Storage management device
First Claim
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1. A storage management device, comprising:
- a plurality of I/O processing modules for accessing units of storage by specifying an address and a time, each of the plurality of I/O processing modules subscribing to process I/O requests for a specified plurality of units of storage and comprising;
a target mode driver in communication with a host for receiving the I/O requests;
a data classifier in communication with the target mode driver for classifying the received I/O requests according to the subscription associating the processing module with the specified plurality of units of storage and extracting control information associated with the requests;
at least one I/O manager in communication with the data classifiers of the processing modules, the at least one I/O manager processing the extracted control information; and
a physical store interface in communication with the I/O managers of the processing modules, the physical store interface for communicating with at least one physical store in response to the processed control information; and
an internal network for communication among the plurality of I/O processing modules,wherein each write request from the host triggers a copy-on-write operation by at least one of the plurality of I/O processing modules, and wherein at least a portion of the control information extracted from the write request is recorded with a timestamp.
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Abstract
A storage management device includes a plurality of I/O processing modules for accessing units of storage by specifying an address and a time. The I/O processing modules receive I/O requests, classify I/O requests, and extract I/O control information associated with the I/O requests. The extracted I/O control information is processed and at least one physical store is communicated with in response to the processed I/O control information.
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Citations
43 Claims
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1. A storage management device, comprising:
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a plurality of I/O processing modules for accessing units of storage by specifying an address and a time, each of the plurality of I/O processing modules subscribing to process I/O requests for a specified plurality of units of storage and comprising; a target mode driver in communication with a host for receiving the I/O requests; a data classifier in communication with the target mode driver for classifying the received I/O requests according to the subscription associating the processing module with the specified plurality of units of storage and extracting control information associated with the requests; at least one I/O manager in communication with the data classifiers of the processing modules, the at least one I/O manager processing the extracted control information; and a physical store interface in communication with the I/O managers of the processing modules, the physical store interface for communicating with at least one physical store in response to the processed control information; and an internal network for communication among the plurality of I/O processing modules, wherein each write request from the host triggers a copy-on-write operation by at least one of the plurality of I/O processing modules, and wherein at least a portion of the control information extracted from the write request is recorded with a timestamp. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of accessing units of storage by specifying an address and a time, the method employing a storage management device comprising a plurality of I/O processing modules, the method comprising the steps of:
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receiving, by a target mode driver in an I/O processing module, I/O requests from a host, wherein all write requests from the host are intercepted; extracting control information associated with the I/O requests and, for each write request, a data payload; determining whether the I/O processing module has subscribed to process the received I/O requests; processing, by an I/O manager in an I/O processing module, the extracted control information if the I/O processing module has subscribed to process the received I/O requests, wherein at least a portion of the control information extracted from said each write request is recorded with a timestamp; and communicating, by a physical store interface, with at least one physical store to access units of storage in response to the I/O requests, wherein data to be overwritten by the data payload from said each write request are backed up. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A storage network, comprising:
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multiple storage devices; and a storage management device, comprising; a plurality of I/O processing modules for accessing units of storage by specifying an address and a time, each of the plurality of I/O processing modules subscribing to process I/O requests for a specified plurality of units of storage and comprising; a target mode driver in communication with a host for receiving the I/O requests; a data classifier in communication with the target mode driver for classifying the received I/O requests according to the subscription associating the processing module with the specified plurality of units of storage and extracting control information associated with the requests; at least one I/O manager in communication with the data classifiers of the processing modules, the at least one I/O manager processing the extracted control information; and a physical store interface in communication with the I/O managers of the plurality of I/O processing modules, the physical store interface for communicating with at least one physical store in response to the processed control information; and an internal network for communication among the processing modules, wherein each write request from the host triggers a copy-on-write operation by at least one of the plurality of I/O processing modules, and wherein at least a portion of the control information extracted from the write request is recorded with a timestamp.
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Specification